Valve piston



Sept. 13, Q v A. TEBALDI VALVE PISTON Filed Dec. 8, 1926' Fig.1; 2% Fig.2) 18 v i 41' 1% 4% 4 49 8 a v 41 .8 m 1% mm '22 1' i; aw, 7 1. A .5

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Patented Sept. '13, 1927.

UN lTED STATES,

f I ALESSANDBO ".I EBAIQDI QF MILAN, IT Y,

YALVE rrs'roin Application filed December s, 1926, serial ire-153,376, and in ma April 19, 1926."

The present invention relates to valve pistons of the kindcomprising a rim having a ,.valve seat and movably mounted on the body. of'a pistonwhich provides a cooperating valve seat, and cooperating means on said" rim and piston body to provide for a respective movement of 'the same along a portion of the piston stroke'as required for thevalve operation. I

bodiment oftthe present invention and Figure 1 is in parta side view and part a transverse sectionon line 11 of Figure 3 of a valve pistonac'cordingto the present invention at'the upper end ofitsstroke with:

its valve in closed'position; V

Figure '2 is a transverse section on line 12 of Figure 3 with the valve in open position;

3"3 of Figure2; I v

As shown insaidfigures, the piston 1 is ar ranged to reciprocate in a cylinder 15 and is conn'ectedby means of a pivot seat 10 and a 2 5 pivot 16 with an usual connectingrod 6 cooperating with a crankshaft, not'shown;

Said pivot seat 10 is engaged on a parti-. tion 17 of thepiston by means of a bolt 11 and a piston'head 12 is in turn fastened on saidbolt 11; a'hub member '13 is engaged between parts 17 and 12 and it carries .a

r number of radial arms 14 lying in the space intermediate partition 17 and head plate 12 and extending through spaces 22 left intermediate longitudinalprojections 23 of the piston body.

The upper portion'l of the piston has a reduced diameter and its top is encircled by a rim 2 having a valve seat surface 18 4 adapted to cooperate with a similar surface 19 of head 12 and said rim has longitudinal extensions 7 extending along the piston body and provided with elongated openings 8' which are entered by the ends of arms 14.

Position plugs 20 are provided in the restricted portion 1 of the piston to provide for the correct'reciprocation of the piston.

Packing rings 21 are provided in the piston body 1 and rim 2, as illustrated.

As illustrated the openings 8 have an elongatedshape to provide for a respective mo- Figure 3 is a transverse section on line moved downwardly, the rim 2 is left stationary; in the cylinder at the beginning of said downward movement owing to friction of its 7 a f ring 21 and the free respective motion pro- 10 Onthe annexed drawing 1S shown an em-- vided by slots8 for arms 14 but when the arms 14: are engaging by their ends the lower ends of said slots 8 the valve rim 2 is moved downward, itsvalve surface 18 being spaced from the piston valve surface 19 thus permitting the flow of fluid along the pathshown by arrows in Figure 2; on the contrary during the upward motion of the piston the valve surface 19 of piston head 12 contacts-with the valve surface 18 of rim 2 and tthis rim is moved upwardly with the piston, the cooperating valve surfaces 1819 being in contact with each other or in valveclosed position. I

As above referred to, the arms 14 are somewhat flexible and thus the engagement of valve rim 2' with piston 1, whichtakes' place through the intermediate of said arms 14, is made i in a gradual and progressive manner without heavy shocks between the Parts.

In the described construction the advantage is secured that the connection of rim 2 with piston body 1 is. made independent from means for connecting the piston body with the crank rod and that the intercon: necting means between said rim and piston may be distributed in a number of points over the periphery of said rim.

Of course the present invention is not restricted to the above described construcmanners within the spirit of appended claims particularly with respect to number and arrangement of the interconnecting members between the piston body and valve rim.

What I claim as my invention and desire to secure by U. S, Letters Patent is:

1. A valve piston comprising a piston body having a valve surface, a rim mounted to move on said body and having a valve surface adapted to cooperate with said piston-body valvesurface, said piston body and 'rim havingcooperating projections and slots for a lost motion interconnectlon of the same, and said projections being flexible to provide for a quiet engagement of said valve rim and piston body.

2.1K valve p ston COI'HlJPlSlDg a piston body having a alve surface, a rim mounted to move on said body and having a valve surface adapted to cooperate with said piston-body valve-surtace., said piston body and rim having cooperating projections and slots for a lost motion interconnection of the same, and said projections being long to provide a flexible and quiet engagement of said valve rim and piston body. i

3. A valve piston comprising a piston body having a valve surface, a rim mounted to move on said body and having a valve surtace adapted to cooperate With said pistonbody val e-surface. lugs extending from said rim. along said piston lmdy and having slots elongated in the direction of the piston axis and arms extending from said piston body and engaging said slots with lost motion.

l. .dL valve piston comprising a piston body having a valve surface. a rim mounted to move on said body and having a valve surface adapted to cooperate with said piston-body valve-surface, lugs extending from said rim ahjmg said piston body and having slots elongated in the direction at the piston axis and flexible arms extending from the said piston body and eir ring said slots with lost niolion.

it valve piston comprising a piston body having a valve surface, a rim mounted to more on said body and having a 'alve surface adapted. to cooperate with said piston-body valve-surface, a plurality of lugs at spaced points of the periphery otli said rim and each having a slot elongated in the direction of the piston axis, and a spider on said piston body having a plurality of arms each engaging one of said slots with lost mot-ion.

6. A valve piston comprising a piston body, a bolt extending along the axis of the same, a hub located on said bolt, radial arms projecting from said hub, a piston head disk secured on said bolt and 'l'astening said hub in position, said piston head disk inning a valve surface on its edge, a rim encircling said piston head disk and having a valve surface adapted to cooperate with said piston-head-disk valve-surface, and lugs extending longitudinally from said rim and having slots elongated in the direction of the nston axis, said arms being long and flexible and engaging said slots with lost motion.

T. A \alvo piston comprising a piston body, a bolt providing means for connect ing said piston body with an associate crank rod. and extending along the piston axis, a hub located on said bolt, radial arms prjecting from said hub, a piston-head-disk having a valve-surface on its edge, said disk being secured on said bolt and fastening said hub in position, a rim encircling said piston head disk and having a valve surface adapted to cooperate with said piston-headdisk valve suriiace, lugs extending longitudinally from said rim and having slots elongated in the direction of the piston axis, said arms being long and flexible and engaging said slots with lost motion.

ALESSANDRO TEBALDI. 

